Designed for use with high-density turkey loadsWorks with all other types of shot as well (except steel)Field-tested for optimum diameterProduces precise full choke patterns41L42 chrome-moly, heat-treated, aircraft-quality alloyKnurled for easy insertion and removalDesigned for use with high-density turkey loads like HEVI-Shot, the H.S. Strut® UnderTaker® XT Ported HD Choke Tube works with all othertypes of shot as well (except steel). Field-tested for optimum diameter to produce precise full choke patterns. Made with 41L42 chrome-moly, heat-treated, aircraft-quality alloy. Knurled for easy insertion and removal.